Working voltage: 3-4.5V. If a higher working voltage is required, please add a current-limiting resistor on the LED, usually tens of ohms to about 100 ohms. Circuit principle: The voice-activated LED melody light circuit is composed of a power supply circuit, a microphone amplifier circuit, and an LED light-emitting indicator circuit. The power supply is input by JP, and C1 is filtered for circuit use. The MIC converts the sound signal into an electrical signal, which is coupled to Q2 for amplification via C2. The amplified signal is sent to the base of Q1, and Q1 drives the LED to emit light. The louder the sound, the higher the brightness of the LED.
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